Motor vehicle accidents account for a majority of TBI cases and are a leading cause for Post Traumatic Stress Disorder (PTSD) among children. The vast majority of these cases involve mild TBI (mTBI) with persistent post concussion syndromes. However, the empirical data on treatment in this field is scarce. Few studies demonstrated that cognitive behavioral therapies can be effective for adults with mild TBI suffering from Acute Stress Disorder, but no research, to date, addressed this question in pediatric population. In the current research we intend to examine the effectiveness of PE in reducing post-traumatic stress symptoms in children and adolescents with m-TBI caused by motor vehicle accident, in comparison to children and adolescents without brain injury.